206881650 has 144 divisors (see below), whose sum is σ = 584962560. Its totient is φ = 52348800.

The previous prime is 206881601. The next prime is 206881667. The reversal of 206881650 is 56188602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1083055 + ... + 1083245.

It is an arithmetic number, because the mean of its divisors is an integer number (4062240).

Almost surely, 2^206881650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206881650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292481280).

206881650 is an abundant number, since it is smaller than the sum of its proper divisors (378080910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206881650 is a wasteful number, since it uses less digits than its factorization.

206881650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 206881650 is about 14383.3810350696. The cubic root of 206881650 is about 591.4354113991.

The spelling of 206881650 in words is "two hundred six million, eight hundred eighty-one thousand, six hundred fifty".